Issue #3055319: Constraint violations are not triggered for Roles on a user's account form

Closes #3055319

core/modules/user/src/AccountForm.php

@@ -402,6 +402,7 @@ protected function getEditedFieldNames(FormStateInterface $form_state) {
       'name',
       'pass',
       'mail',
+      'roles',
       'timezone',
       'langcode',
       'preferred_langcode',
@@ -420,6 +421,7 @@ protected function flagViolations(EntityConstraintViolationListInterface $violat
       'name',
       'pass',
       'mail',
+      'roles',
       'timezone',
       'langcode',
       'preferred_langcode',